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Writing unicode data with jdbc to a database

Posted on 1998-08-02
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Last Modified: 2009-04-01
I have an application which has to use simultaniously strings in more than one language and store these string to a database. Java supports unicode strings but not the database which uses 8-bit characters.
I saw that from a jdbc resultset I can get with getUnicodeStream() a stream that interprets the data got from the database as unicode characters.

My question is how can I write Unicode Data with jdbc to a database?? To write some data I have to execute a SQL statement. As I have experimented having an 16-bit java string and executing it does not write correct data to the database
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Question by:stefos
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7 Comments
 
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by:shchuka
ID: 1230544
Can you write a byte array to a database?  There's a method in java that converts a unicode string into a byte array.
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by:gadio
ID: 1230545
Convert the unicode string to bytes and then cinvert each byte to a char and write it to the database. Note that when you read from the database you will have to do a reverse process.
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Author Comment

by:stefos
ID: 1230546
gadio
when I convert each byte to a char, I have 16bit chars again. What will be written to the database???

shschuka
I don't know how to write a byte array to a database. That's why I ask. The JDBC API I saw does not provide any such methods, except (maybe) the prepared statment putxxx() methods, but they also seem to make some conversions afterwords which I cannot control.

Folks, for 500 points I need versy specific answers
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Accepted Solution

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gadio earned 500 total points
ID: 1230547
stefos, when you define the database (for example in oracle) you can define 8 or 16 bit character. Lets assume that what you have is 8. In that case, when you do what I offered (that makes characters that are 16 bit wide but the data is ONLY in the lower 8 bit) then only the lower 8 bit will be written and you information will not be truncated. For example:

string:             "ABCD"
chars:              0x0041, 0x0042, 0x0043, 0x0044
bytes:              0x00, 0x41, 0x00, 0x42, 0x00, 0x43, 0x00, 0x44
converted to chars: 0x0000, 0x0041, 0x0000, 0x0042, 0x0000, 0x0043, 0x0000, 0x0044
written to the DB:  0x00, 0x41, 0x00, 0x42, 0x00, 0x43, 0x00, 0x44

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Author Comment

by:stefos
ID: 1230548
gadio
This won't work because my informatio is NOT in the last 8-bit of the unicode cahracters, but is distributed in all 16-bits (I have to support more than 6 languages simultaniously, greek characters too). Thats why I started having problems with writing the data anyway.

If I could read and write unicode characters, my problem would be solved. I use MS SQL Server 6.5.
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Expert Comment

by:gadio
ID: 1230549
My answer did ment for 16bit unicode. I explain again:
String you have "\0x03b1\0x03b2\0x03b3"
1. String: alfa beta gama
2. unicode: 0x03b1, 0x03b2, 0x03b3
3. bytes:   0x03, 0xb1, 0x03, 0xb2, 0x03, 0xb3
4. to chars:0x0003, 0x00b1, 0x0003, 0x00b2, 0x0003, 0xb00b3
5. written in DB: 0x03, 0xb1, 0x03, 0xb2, 0x03, 0xb3

Unfortunatly, I'm not familiar with MSSQL but I don't see why this approach wouldn't work with any DB.

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Expert Comment

by:retesh_shah1
ID: 24044646
Hi there,
I think a simpler solution is
change the database table columns to 'NVARCHAR' then use the following code to insert the data
insert into <table> values (N'< data>' , N'<data 2>');

alternatively you can try the following code if your application is developed in java
insert into <table> values (?,?)
define params

Retesh
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